John kibby



(No Model.) J. KIRBY, Jr.

' LAMP. No. 281,633. I PatentedJ uly 11,1883.

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3 UNITED STATE PATENT OFFICE.

JOHN KIRBY, JR, or minnow, KENTUCKY, Assreuon ro POST & .00., or

. CINCINNATI, OHIO.

LAMP.

SPECIFICATION forming part of Letters Patent No. 281,633, dated July '17, 1883.

Application filed June 12,1882. (No model.)

To all whom/it may concern:

Be it known that I, JOHN"KIRBY, Jr., of Ludlow, Kenton county, Kentucky, have invented a certain new and useful Improvement in Lamps,'of which the following is a full, clear, and exact specification, reference being had to the accompanying drawing, forming part of this specification, in which the. figure shows my improvement, and is a vertical section of the same, and is shown in connection with the other parts of a lamp.

O is a sliding cap resting on top of chimney; G, chimney A, cylinder rigidly attached to the lamp -supports, within which cap 0 slides; E, shade-holderno particular mode of securing shade to its holder is claimed-any of the usual means-may be used; B, lamp support or bracket; 1), arm attached rigidly to cylinder A and bracket B.

My invention relates to lamps, more especially to that class of lamps in use in railwaycars, whichtake the air of combustion from the interior of the car and deliver the results of combustion to the outside through an exit into which the chimney opens. Such lamps, as ordinarily constructed, are frequently extinguished by sudden gusts of air rushing under the shade and past the end of the chimney through the'exit. The gust exhausts the air from the chimney, and thus puts out the light.

The object of my invention is to overcome this objection and render the light of the lamp constant, notwithstanding the sudden gusts of air to which car-lamps are subject; and it consists in protecting the top of the chimney from currents of air by means of a self-adjusting cap, 0, resting on the top of the chimney G. The cap (J is movable vertically, and fits loosely in its holderthe cylinder A-and adjusts itself automatically to chimneys of differing lengths, and moves up with the chimney when the chimney is raised from its bottom fastenings to be removed from the lamp.

My invention is embodied in the devices shown in the drawing accompanying this statement of invention, as follows: A cylinder, A, having its edges turned to form narrow interior rims at its top and bottom, is rigidly secured by an arm, D, to the lamp-support B.

' Over this cylinder A is fitted a hurricane-cap,

B, of any desired form, having an opening in its top, f, of diameter suitable to the chimney to be used. This hurricane-cap Bis described here to show clearly the position, purpose, and construction of my sliding cap 0, and-is not of my invention. I The chimney or sliding cap Ois a cylinder of a diameter less than the diameter of cylinder A, and has a flange, a, projecting at an angle less than a right angle from its lower edge toward the center. there is an opening, f, in this flange, of a diameter somewhat less than the diameter of the top of "the chimney to be used. The chimney or sliding cap 0 is set inside the cylinder A, and is secured therein by turning up the rim a on one of the ends of cylinder A, the other rim having been turned up before cap 0 is inserted. The retaining-rim a at either end may be replaced by a wire soldered in, or

by set-screws. 7o

It will be seen that as the cap Crests on the chimney and may move vertically, chimneys of differing lengths may be used with the same cap in the same lamp, and the chimney may be'raised (carrying with it the cap) to be removed from the lamp, and that when the chimney is in position in the lamp gusts of air cannot rush under the shade F, held by shade-holder E, past the top of chimney G, through cylinder A and hurricane-cap B, to the outer air. Incidentally the sliding cap 0 is a chimneyholder, since while the lamp is in use the cap G rests on the top of the chimney. Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is as follows: In a car-lamp, the combination, with the chimney, of a sliding cap, resting, when in position, onthe top of the chimney, and held from displacement by the cylinder A, supportedby the lamp-supporting bracket, and having inturned flanges a, all constructed'andarranged substantially as and for the purpose set forth. The foregoing specification of my invention signed by me this 5th day of June, A. D. 1882 5 At the center 60 

